{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Disease", "Chemical"], "input": "The effect was attenuated by both the NK1 receptor selective antagonist RP 67 , 580 and the NK2 receptor selective antagonist SR 48 , 968 , given intra - arterially , suggesting that it was mediated by stimulation of both NK1 and NK2 receptors ."}
{"Disease": [], "Chemical": ["RP 67 , 580", "SR 48 , 968"]}